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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d6b0c6117070ff42aa3b89df3eb60b6b74fb333c661180740b9a6e436e544fb' 
  AND token = 'dmvwGApsKjB5bBmM8+peu7bFdq7XqoMSVUHltsCjamU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}